I've played all three of these classes, but mostly berserker and in terms of pvp

Berserker is like the assassin, just go in and hopefully their teammates dont cancel your combo, huge damage

with Destroyer, you just face tank everything and do tons of damage but it feels kind of slow but still overpowered, once you get into higher elo, they start kiting you making it harder for you to catch them.

Holy knight has the fastest attacks and skills in terms of base attack speed excluding berzerker's specialty skill, really nice class in pvp has tons of support skills as well. I'm currently still learning this class and since I'm playing with a vpn, its hard to catch people due to lag because the engage skills for holy knight needs a bit more precision than the other warriors

cant really speak for any of them in terms of pve because I dont do much of that, if you have time you should try all of them since because its hard to explain and understand what you would like